Low energy, cold process formulation aid
View Patent ↗Provided are cold process formulation aids (CPFAs), methods for their manufacture, and personal care products made using them. CPFAs include (i) a polymer having an aliphatic backbone and a plurality of pendant groups thereon that are pendant ionic or ionizable groups, or pendant groups having at least one permanent dipole that includes an acid, alcohol, thiol, ester, amine, amide, imide, imine, or nitrile moiety, and (ii) a wax selected from natural waxes and synthetic waxes, wherein if the wax is not micronized and is not self-emulsifying, the ratio, by weight, of the non-micronized wax to the polymer having an aliphatic backbone is from about 60:40 to 80:20, and if the wax is a micronized wax or a self-emulsifying wax, the ratio, by weight, of wax to polymer backbone is 70:30 to 98:2.
1. An anhydrous cold process formulation aid in the form of a flake, slab, powder, a paste, a semi-solid, or a slurry consisting essentially of
(i) a polymer having an aliphatic backbone selected from a polyquaternium polymer and a polymer having a plurality of pendant groups selected from alkali metal carboxylate groups and ammonium carboxylate groups, and
(ii) a wax selected from the group consisting of natural waxes and synthetic waxes, wherein if the wax is not micronized and is not self-emulsifying, the ratio, by weight, of the non-micronized wax to the polymer having an aliphatic backbone is from about 60:40 to 80:20, and if the wax is a micronized wax or a self-emulsifying wax, the ratio, by weight, of wax to polymer backbone is 70:30 to 98:2,
wherein when the anhydrous cold process formulation aid is mixed with an aqueous medium at a temperature not exceeding the melt point of the wax or the melt point of the cold process formulation aid, a hydrogel or an emulsion is formed.
2. The anhydrous cold process formulation aid of claim 1 wherein the polymer having an aliphatic backbone has pendant groups that are alkali metal or ammonium carboxylate groups.
3. The anhydrous cold process formulation aid of claim 1 wherein the polymer having an aliphatic backbone is the sodium salt of poly(acrylic acid).
4. The anhydrous cold process formulation aid of claim 1 wherein the polymer having an aliphatic backbone is a polyquaternium.
5. The anhydrous cold process formulation aid of claim 4 wherein the polymer is a polyquaternium selected from the group consisting of Polyquaternium 7 and Polyquaternium 37.
6. The anhydrous cold process formulation aid of claim 1 wherein the wax is a natural wax selected from the group consisting of sunflower wax, candelilla wax, olive wax, and carnauba wax.
7. The anhydrous cold process formulation aid of claim 1 wherein the wax is a synthetic wax selected from the group consisting of polyethylene, glyceryl monostearate, paraffin, and polyglyceryl-3 stearate.
8. The anhydrous cold process formulation aid of claim 1 wherein the wax is a micronized wax, having a mean particle size from 5 to 50 microns.
9. The anhydrous cold process formulation aid of claim 1 wherein when mixed with an aqueous medium at a temperature not exceeding 30° C., the cold process formulation aid forms a hydrogel or an emulsion.
10. The anhydrous cold process formulation aid of claim 1 further containing a polymer having a polysaccharide backbone.
11. A method for producing a eutectic, cold-process formulation aid comprising the sequential steps of:
(i) adding a wax to a vessel, heating the wax to a temperature that is at least about 5° C. above the melt point of the wax, mixing the wax until a homogenous batch of molten wax is achieved;
(a) adding a polymer having an aliphatic backbone selected from a polyquaternium polymer and a polymer having a plurality of pendant groups selected from alkali metal carboxylate groups and ammonium carboxylate groups to the batch of molten wax from step (i), mixing the wax and the polymer together, while heating to a temperature of at least about 5° C. above the higher of the melt point of the wax or (b) the softening point of the polymer, until a homogenous mixture is produced;
(ii) cooling the mixture from step (i) to a temperature of about 5° C. above the congealing point of the mixture;
(iii) pouring the mixture from step (ii) onto a chilled surface having a temperature from about −10° C. to about 10° C., producing a cold-process formulation aid in the form of a solid wax, or wax-like substance;
wherein if the wax is not micronized and is not emulsifying, the ratio, by weight, of the non-micronized/non-emulsifying wax to the polymer having an aliphatic backbone is from about 60:40 to 80:20, and if the wax is a micronized wax or an emulsifying wax, the ratio, by weight, of wax to polymer backbone is 70:30 to 98:2; and
wherein when mixed with an aqueous medium, the cold-process formulation aid forms a hydrogel or an emulsion.
12. The method for producing a cold-process formulation aid according to claim 11 wherein
(a) in step (i), two waxes, a first wax and a second wax, are combined and the two waxes are heated to a temperature that is at least about 5° C. above the higher of (x) the melt point of the first wax and (y) the melt point of the second wax, and
(b) in step (ii), after addition of a polymer having an aliphatic backbone selected from a polyquaternium polymer or a polymer having an aliphatic backbone with a plurality of pendant groups selected from alkali metal carboxylate groups and ammonium carboxylate groups, the two waxes and the polymer are mixed together, while heating to a temperature of at least about 5° C. above the higher of (x) the melt point of the first wax, (y) the melt point of the second wax, or (z) the softening point of the polymer.
13. The method for producing a cold-process formulation aid according to claim 11 wherein in step (ii), two polymers having an aliphatic backbone selected from a polyquaternium polymer and a polymer having a plurality of pendant groups selected from alkali metal carboxylate groups and ammonium carboxylate groups, a first polymer and a second polymer, are mixed with the wax, while heating to a temperature of at least about 5° C. above the higher of (xx) the melt point of the wax, (yy) the softening point of the first polymer, or (zz) the softening point of the second polymer.
14. The method for producing a cold-process formulation aid according to claim 12 wherein in step (ii), two polymers having an aliphatic backbone selected from a polyquaternium polymer and a polymer having a plurality of pendant groups selected from alkali metal carboxylate groups and ammonium carboxylate groups, a first polymer and a second polymer, are mixed with the two waxes, while heating to a temperature of at least about 5° C. above the higher of (aa) the melt point of the first wax, (bb) the melt point of the second wax, (cc) the softening point of the first ionic polymer, or (dd) the softening point of the second ionic polymer.
15. An anhydrous cold process formulation aid that is directly soluble in a cosmetically-acceptable ester or a Caprylic/Capric Triglyceride without a petroleum-derived solvent, the cold process formulation aid consisting essentially of
(a) a polymer having an aliphatic backbone selected from a polyquaternium polymer and a polymer having a plurality of pendant groups selected from alkali metal carboxylate groups and ammonium carboxylate groups; and
(b) a self-emulsifying wax, and
wherein the ratio of (a) the polymer having an aliphatic backbone to (b) self-emulsifying wax is from 2:3 to 9:1, and
wherein when the cold process formulation aid is mixed with an aqueous medium at a temperature not exceeding the melt point of the wax component of the cold process formulation aid or the melt point of the cold process formulation aid itself the resulting mixture forms a hydrogel or an emulsion is formed.
16. The anhydrous cold process formulation aid of claim 15 wherein the polymer having an aliphatic backbone is a polyacrylic acid, a polyacrylate, a polyacrylate copolymer, a polyacrylate crosspolymer, or a salt thereof.
17. The anhydrous cold process formulation aid of claim 16 wherein the self-emulsifying wax is a polyglyceryl ester.
18. The anhydrous cold process formulation aid of claim 15 wherein the polymer having an aliphatic backbone is a polyquaternium.
19. The anhydrous cold process formulation aid of claim 18 wherein the self-emulsifying wax is a polyglyceryl ester.
20. An anhydrous cold process formulation aid that does not include a petroleum-based solvent and consists essentially of:
(i) a polymer having an aliphatic backbone selected from a polyquaternium polymer and a polymer having plurality of pendant groups selected from alkali metal carboxylate groups and ammonium carboxylate groups;
(ii) a self-emulsifying wax, and
(iii) a cosmetically-acceptable ester or a Caprylic/Capric Triglyceride wherein when the cold process wax is mixed with an aqueous medium at a temperature not exceeding the melt point of the wax or the melt point of the cold process formulation aid hydrogel or an emulsion is formed.
21. The anhydrous cold process formulation aid of claim 20 wherein the ratio of (a) the polymer having an aliphatic backbone to (b) the self-emulsifying wax to (c) the cosmetically-acceptable ester or Caprylic/Capric Triglyceride is from about 5:30:65 to about 70:15:15.
22. The anhydrous cold process formulation aid of claim 21 wherein the ratio of (a) the polymer having an aliphatic backbone to (b) the self-emulsifying wax to (c) the cosmetically-acceptable ester or Caprylic/Capric Triglyceride is about 60:10:30.
23. The anhydrous cold process formulation aid of claim 20 wherein the polymer having an aliphatic backbone is a polyacrylic acid, a polyacrylate, a polyacrylate copolymer, a polyacrylate crosspolymer, or a salt thereof.
24. The anhydrous cold process formulation aid of claim 23 wherein the self-emulsifying wax is a polyglyceryl ester.
25. The anhydrous cold process formulation aid of claim 20 wherein the polymer having an aliphatic backbone is a polyquaternium.
26. The anhydrous cold process formulation aid of claim 25 wherein the self-emulsifying wax is a polyglyceryl ester.
27. An anhydrous cold process formulation aid in the form of a flake, slab, powder, a paste, a semi-solid, or a slurry consisting essentially of (i) a quaternary ammonium polymer and (ii) a wax selected from the group consisting of natural waxes and synthetic waxes, wherein if the wax is not micronized and is not self-emulsifying, the ratio, by weight, of the non-micronized wax to the quaternary ammonium polymer is from about 60:40 to 80:20, and if the wax is a micronized wax or a self-emulsifying wax, the ratio, by weight, of wax to the quaternary ammonium polymer is 70:30 to 98:2, wherein when the cold process formulation aid is mixed with an aqueous medium at a temperature not exceeding the melt point of the or the melt point of the cold process formulation aid a hydrogel or an emulsion is formed.